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The #1 New York Times bestselling author Iris Johansen teams up once again with her Edgar award-winning son Roy to bring us a new heart-pounding thriller involving the search for a mysterious Atlantean city In Shadow Zone, while mapping the ancient underwater city of Marinth in the Atlantic Ocean, submersible designer Hannah Bryson makes a shocking discovery: she may have finally uncovered the truth about the once-glorious city's mysterious demise. Long ago it was a thriving metropolis bursting with culture and life—Marinth's sudden disappearance has plagued scientists for years. But now, with her unexpected new findings, Hannah realizes that the ancient city's explosive secret could have dire consequences for the modern-day world.

But Hannah isn't the only one who realizes it. When her key artifact is hijacked en route to a research lab, she is thrust into an adventure in which she must match wits against a terrifying enemy who will kill anyone who stands in his way. And when Hannah becomes his target, she knows that her best hope for survival lies with Kirov, a mysterious and deadly man from her past. Together they will race to unravel Marinth's last great secret in order to prevent a catastrophe of global proportions. Before the lethal game is over, however, Hannah will realize that no one is above suspicion.

“Bestseller Johansen and her Edgar-winning son, Roy, collaborate on their first thriller with entertaining results.” —Publishers Weekly on Silent Thunder

“Gripping.” —Booklist on Silent Thunder

“[In Silent Thunder]...you'll be rewarded with a bumpy roller-coaster ride as you try to separate the good guys from the bad.” —Rocky Mountain News on Silent Thunder

“Talent obviously runs in the Johansen family...The duo has no difficulty weaving in fascinating technical details with the explosive action of this nonstop stunner.” —Romantic Times BOOKreviews on Silent Thunder

“Silent Thunder [is] another grab-you-by-the-throat dash that pulled me along on a frantic chase for a deadly puzzle piece.” —BlogCritics magazine on Silent Thunder

“Bestseller Johansen and her Edgar-winning son, Roy, collaborate on their first thriller with entertaining results.” —Publishers Weekly on Silent Thunder

“Gripping.” —Booklist on Silent Thunder

“[In Silent Thunder]...you'll be rewarded with a bumpy roller-coaster ride as you try to separate the good guys from the bad.” —Rocky Mountain News on Silent Thunder

“Talent obviously runs in the Johansen family...The duo has no difficulty weaving in fascinating technical details with the explosive action of this nonstop stunner.” —Romantic Times BOOKreviews on Silent Thunder

“Silent Thunder [is] another grab-you-by-the-throat dash that pulled me along on a frantic chase for a deadly puzzle piece.” —BlogCritics magazine on Silent Thunder